Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp
Published Jun 15, 2018
5.9
MEDIUMCVSS 3.0
EPSS 0.50%
Description
Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
Affected products
No data.
- ≥ 2.5.0 · ≤ 2.7.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
AV:L/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.50% (0.00499) | 40.52th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.50% (0.00499) | 41.81th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.14% (0.00142) | 50.44th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.14% (0.00142) | 49.29th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00131) | 46.21th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (3)
- https://botan.randombit.net/security.html x_refsource_CONFIRMThird Party Advisory
- https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3 x_refsource_CONFIRMPatchThird Party Advisory
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://botan.randombit.net/security.html | x_refsource_CONFIRMThird Party Advisory | |
| https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.